LInux: Window Resize Support

CardealRusso · Oct 19, 2024 · 239783f · 239783f
1 parent 3d2f3b0
commit 239783f
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Showing 3 changed files with 20 additions and 4 deletions.
diff --git a/examples/mousebuttons-c/main.c b/examples/mousebuttons-c/main.c
@@ -14,12 +14,10 @@
  * - Closes a window
  * ============================================================ */
 static int run() {
-  uint32_t buf[W * H];
   struct fenster f = {
       .title = "Mouse Buttons",
       .width = W,
       .height = H,
-      .buf = buf,
   };
   fenster_open(&f);
   while (fenster_loop(&f) == 0) {

diff --git a/src/fenster/fenster.h b/src/fenster/fenster.h
@@ -21,8 +21,8 @@
 
 struct fenster {
   const char *title;
-  const int width;
-  const int height;
+  int width;
+  int height;
   uint32_t *buf;
   int keys[256];      // keys are mostly ASCII, but arrows are 17..20
   int modkeys[4];     // ctrl, shift, alt, meta

diff --git a/src/fenster/fenster_linux.h b/src/fenster/fenster_linux.h
@@ -7,6 +7,7 @@ static Atom wmDeleteWindow;
 // clang-format on
 
 FENSTER_API int fenster_open(struct fenster *f) {
+  f->buf = (uint32_t*)malloc(f->width * f->height * sizeof(uint32_t));
   f->dpy = XOpenDisplay(NULL);
   int screen = DefaultScreen(f->dpy);
   f->w = XCreateSimpleWindow(f->dpy, RootWindow(f->dpy, screen), 0, 0, f->width,
@@ -39,6 +40,23 @@ FENSTER_API int fenster_loop(struct fenster *f) {
   while (XPending(f->dpy)) {
     XNextEvent(f->dpy, &ev);
     switch (ev.type) {
+case ConfigureNotify: {
+    if (ev.xconfigure.width != f->width || ev.xconfigure.height != f->height) {
+        uint32_t *new_buf = realloc(f->buf, ev.xconfigure.width * ev.xconfigure.height * sizeof(uint32_t));
+        if (!new_buf) break;
+
+        f->img->data = NULL;
+        XDestroyImage(f->img);
+
+        f->buf = new_buf;
+        f->width = ev.xconfigure.width;
+        f->height = ev.xconfigure.height;
+        f->buf_size = f->width * f->height * sizeof(uint32_t);
+
+        f->img = XCreateImage(f->dpy, DefaultVisual(f->dpy, 0), 24, ZPixmap, 0,
+                            (char *)f->buf, f->width, f->height, 32, 0);
+    }
+} break;
     case ClientMessage:
       if ((Atom)ev.xclient.data.l[0] == wmDeleteWindow) {
         return 1;